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COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division <br />• Rationale - Page 2. Permit No. CO-0042161. <br />III. RECEIVING STREAM <br />A. Identification, Classification and Standards <br />1. Identification: Discharges to Fish Creek, tributary to Trout <br />Creek, segment 13b of the Yampa River Sub-basin. <br />2. Classification: This stream segment is classified for the <br />following uses: Recreation, Class 1; Aquatic Life, Class 1 (Cold); <br />Agriculture. <br />3. Numeric Standards: The standards which have been assigned in <br />accordance with the above classifications can be found in 3.3.0, <br />Classifications and Numeric Standards for the Upper Colorado River <br />Basin (5 CCR 1002-8), as amended August 30, 1988. <br />IV. FACILITY DESCRIPTION <br />A. Purpose of Amendment <br />The facility is an underground coal mine. By letter of October 11, <br />1989 and December 29, 1989, the permittee has requested that several <br />• minor changes be made to the original permit. The first change is to <br />the facility location, which is now about 2700 feet southwest of the <br />originally planned site. This will be reflected in the facility <br />location description in the permit, but will not change any permit <br />conditions. <br />The other change is to modify the whole effluent toxicity (WET) <br />testing procedures slightly for the chronic testing, due to facility <br />operating conditions. <br />The Fish Creek dewatering facility pumps water from the underground <br />sump area to the surface ponds. The pumps are activated once the <br />water reaches a certain level in the borehole s. Water continues to be <br />pumped to the surface until the water has fallen to the second, lower <br />level. The pumps are not activated again until the water reaches the <br />upper level. <br />As originally outlined in the Division guidance document, Guidelines <br />for Conducting Whole Effluent Toxicity Tests, the chronic WET testing <br />is to be conducted using three eight-hour composite samples of the <br />effluent, which then have a limited holding time. Since the facility <br />began operating, the permittee has found that the time frame of the <br />discharge cycle is that the pumps will turn on about every 5.4 days <br />and that they will remain on for approximately 13 hours. Since this <br />r1 <br />LJ <br />